Pipeline noise Excessive dead bends in pipelines or loose fixing clips can also generate vibration and noise. Therefore, in pipeline layout, dead bends should be avoided as much as possible, and loose clips should be tightened in a timely manner. Noise of overflow valve Overflow valves are prone to generating high-frequency noise, mainly due to the unstable performance of the pilot valve, which is caused by the high-frequency oscillation of the pressure in the front chamber of the pilot valve leading to air vibration. The main reasons are: (1) Air is mixed into the oil, forming air pockets in the front chamber of the pilot valve and causing high-frequency noise. At this point, it is necessary to promptly exhaust the air and prevent external air from re entering. (2) The needle valve is excessively worn due to frequent opening during use, causing the conical surface of the needle valve to not fit tightly with the valve seat, resulting in unstable pilot flow, pressure fluctuations, and noise. At this time, it should be repaired or replaced in a timely manner. (3) The pressure regulating function of the pilot valve is unstable due to spring fatigue deformation, causing large pressure fluctuations and……

Although the causes of cavitation are multifaceted, as long as necessary measures are taken to actively prevent it, the phenomenon of cavitation can still be avoided. Below are some preventive measures that should be taken to address the causes of cavitation in the Caterpillar 320D excavator. (1) Strictly control the selection of hydraulic oil Strictly select hydraulic oil according to the oil standards. Choosing high-quality hydraulic oil can effectively prevent the occurrence of bubbles in the hydraulic system during operation. When selecting the oil, it should be selected according to the lowest temperature in different regions, and the hydraulic oil should be added according to the oil dipstick standard. At the same time, the hydraulic system should be kept clean (when filling the hydraulic oil, it should prevent moisture and other impurities from being brought in). The oil quality, oil level and oil color of the hydraulic oil should be checked frequently. If water bubbles, foam are found in the hydraulic oil, or the oil turns milky white, the source of air in the oil should be carefully found and eliminated in time. (2) Prevent excessive oil temperature and reduce hydraulic shock Reasonable design of the cooling system and prevention……

When repairing the hydraulic cylinder of the CAT 336D excavator, we often see some honeycomb shaped holes on the inner wall of the hydraulic cylinder, piston or piston rod surface, which are all caused by cavitation. The harm of cavitation in hydraulic cylinders is quite significant, as it can cause the mating surface to turn black, and even lead to the burning of support rings and sealing rings, resulting in internal leakage of the hydraulic cylinder. When cavitation and other types of corrosion work together, it will accelerate the corrosion rate of the main parts of the hydraulic cylinder several times or even dozens of times, seriously affecting the normal use of the excavator. Therefore, targeted prevention of cavitation in hydraulic cylinders is essential. 1. The main cause of cavitation (1) Essence analysis of cavitation The generation of cavitation is mainly due to a certain amount of air mixed into the oil between the piston and the guide sleeve during the operation of the hydraulic cylinder. As the pressure gradually increases, the gas in the oil will turn into bubbles. When the pressure reaches a certain limit, these bubbles will rupture under the action of high pressure, rapidly applying high-temperature……

Air can also have a certain impact on the hydraulic oil of used excavator. When air enters the oil, it can create voids or cavitation, causing damage to the metal sealing material and even noise, which can compromise the stability of the hydraulic system. The reason for the above obstacles may be that the joint is not fixed properly, resulting in sealing problems and allowing air to enter. Generally speaking, hydraulic systems must have good sealing, especially at critical interface positions. Only by fixing the interface can the oil tank be sealed properly, thereby preventing air from entering and causing damage to the system. Another situation is that the oil suction pipeline and connecting system pipeline in the hydraulic system are damaged for some reason, which may be worn through or corroded, leading to the entry of air. The reason for this is that its pipeline layout design does not meet the standards and actual needs. Therefore, in order to solve this problem, it is necessary for the market to clean and maintain the pipeline, reduce external corrosion, and prevent air from entering. The last possible reason for air entering the hydraulic system may be due to time constraints. During……

1. Prevent the backflow of hot air during use The filling around the radiator is commonly known as "sponge". But it cannot be replaced by any 'sponge'. The requirements for hydraulic excavators are good corrosion resistance, temperature resistance, and poor ventilation, as their main function is to prevent hot air reflux. To prevent the cold air drawn in from the front of the radiator from rising in temperature and entering the rear of the radiator (engine compartment), it cannot flow back to the front of the radiator. If some high-temperature gas flows back to the radiator, it will inevitably reduce the system's heat dissipation effect, causing an increase in oil and water temperature, which will prevent the engine from working properly and result in early damage. Therefore, during the use of hydraulic excavators, it is essential not to neglect the inspection and repair of the "sponge" around the radiator, and the damaged parts should be replaced in a timely manner. 2. Ensure smooth discharge of hot air ① The partitions in the engine compartment behind the radiator cannot be dismantled or discarded at will, otherwise it will cause vortices to form during the circulation of hot air, affecting the exhaust……

A used Caterpillar 320 excavator, when working for 3000 hours, experienced brake failure during the rotation of the upper turntable, causing the rotation to not stop in time; After continuing to work for another 2 hours, the above-mentioned fault symptoms became increasingly severe. During the inspection, it was found that the turntable cannot stop immediately after rapid rotation, but needs to rotate in the same direction for a certain distance before stopping rotation; When the turntable rotates slowly, it must rotate more than 90 degrees in the opposite direction before stopping. 1. Fault analysis From the fault phenomenon, it can be seen that the main cause is insufficient braking force. There are several reasons for insufficient braking force, so they were investigated item by item. (1) Brake pad wear and insufficient spring force Stop the machine on a slope, rotate the upper turntable to a perpendicular position to the slope, turn off the engine, and at this time, the turntable does not rotate towards the lower side due to gravity; Cut off the oil circuit at the brake control valve PG, start the engine, and operate the pilot valve. At this time, the turntable cannot rotate. The above situation indicates……

1、 Maintain a certain height of electrolyte level According to usage requirements, the electrolyte level of used excavators should be 10-15mm higher than the electrode plate. When checking, first use a glass tube with an inner diameter of 4-6mm and a length of about 150mm, vertically insert it into the filling port until it contacts the upper edge of the electrode plate, and then use the index finger to press the electrolyte in the glass tube to the height where the electrolyte plane in the battery is higher than the electrode plate. After measurement, return the electrolyte in the glass tube. If the liquid level is not high enough, add distilled water in a timely manner. Do not add spring water, river water, tap water, or dilute sulfuric acid, otherwise it will increase the density of the electrolyte and damage the electrode plate. Attention should also be paid; Distilled water should be added when the battery is in a charging state to ensure more uniform mixing of the electrolyte; The liquid level should not be too high to prevent electrolyte overflow during charging and discharging. 2、 Timely remove the yellow white paste on the shell cover The yellow white paste……

1. Always keep the battery in a fully charged state. To prevent the relative density of the electrolyte from decreasing and freezing, and to prevent shell cracking, electrode bending, and active substance detachment. 2. The relative density of the electrolyte should be minimized as much as possible without freezing. 3. Check the liquid level of the battery electrolyte before excavator operation every day, and add distilled water if necessary. Adding distilled water to the battery can only be done when it is fully charged, allowing the distilled water to quickly mix with the electrolyte to reduce the possibility of distilled water freezing. 4. Due to the decrease in battery capacity in winter, the engine should be preheated before cold starting. The starting motor should not run for more than 5 seconds each time, and the interval between each start should not be less than 15 seconds. 5. When parking for a long time, insulation measures should be taken for the battery. 6. Regularly clean the battery to indicate impurities and keep the surface of the battery clean. 7. Regularly check whether the electrode post clamp of the battery is loose, and tighten it in a timely manner if it is……

The reasons for the water tank leakage of CAT 336D excavator may include the following: Water pipe rupture: Water pipe rupture or small cracks may cause water tank leakage. If this situation is found, you can try using a strong water tank sealing agent to solve it. Untightened water tank cover: Untightened water tank cover can cause unstable pressure inside the water tank, leading to water leakage. Confirm and tighten the water tank cover to maintain its sealed state. Engine problem: Engine oil emulsification can affect heat dissipation. Check the engine oil cap. If there are signs of emulsification, it may be a problem with the cylinder gasket. At this point, it is recommended to go to a repair shop for inspection and replacement. Rubber hose joint leakage: Loose or damaged rubber hose joints are also common sources of water leakage. Fix the joint with a screwdriver or temporarily wrap it with adhesive tape. In severe cases, professional repairs are required. Heat pipe rupture: If the leaking water source comes from the heat pipe, you can inject a sealing agent, cut off the leaking part, block it with soap cotton balls, and then use pliers to handle the cut end……

Caterpillar 336D excavators, like humans, are affected by summer heat waves every year. During the homework process, the temperature of the excavator increases with the outdoor environment temperature, which is a normal phenomenon. When the temperature is high, as long as it is handled properly, it will not cause damage to the excavator. If your excavator suddenly triggers a high temperature alarm during operation, please do not panic. Follow the following steps to effectively reduce the water and oil temperature. 1. "Reduce load, low speed" to minimize heat absorption Turn off the pilot lock and idle the throttle to first gear to reduce the load and speed. The heat generated by the friction of various moving parts will correspondingly reduce the heat generated by the engine, indirectly reducing the heat absorbed by the coolant and thus reducing the speed of water temperature rise. 2. Increase the air intake of the water tank to accelerate heat dissipation Open the side doors on both sides of the excavator to increase the airflow entering the radiator, which can quickly dissipate the cabin temperature and reduce the rate of water temperature rise. 3. After the temperature drops, check if there is a shortage of……

The possible causes and solutions for the malfunction of CAT 336 generator are as follows: Abnormal generator output voltage: If Carter displays abnormal generator output voltage, it may cause the load to malfunction or fail to start. At this point, it is necessary to check whether the output voltage of the generator is normal and whether the corresponding circuit is damaged. Heating during no-load operation: If there is abnormal heating during the operation of the generator under no-load conditions, it may be caused by damage to the internal windings or rotor of the motor. At this point, it is necessary to replace the coil or rotor. No output voltage: If there is no output voltage when the generator is running, it may be caused by a fault in the motor itself or a problem with the load. At this point, it is necessary to check whether the entire generator is faulty. Engine malfunction light on: The C9 engine malfunction light on the Caterpillar 336D excavator may be due to issues with the intake system, fuel system, ignition system, and other aspects. For example, low voltage of the intake pressure sensor may be caused by sensor damage, circuit failure, or intake……

1、 Reason for oil leakage of CAT 336D excavator turntable The oil leakage of the Carter excavator turntable may be due to the following reasons: 1. The sealing components are aging. Over time, the seals of excavators will gradually age and lose their sealing performance, leading to oil leakage from the turntable. 2. Improper use. Improper use is also one of the causes of oil leakage in the turntable, such as frequent sharp turning, braking, and other operations during construction, which can easily lead to wear and deformation of the turntable seal, resulting in oil leakage. 3. Quality issues. The quality problems of the excavator turntable itself may also lead to oil leakage, such as defects in the manufacturing process. 2、 Solution to oil leakage of CAT 336D excavator turntable The solutions for oil leakage in the turntable of Carter's used excavator vary depending on the reasons. 1. Replace the seal. If the oil leakage problem is caused by aging of the seal, it is necessary to replace the seal. Generally speaking, the lifespan of excavator turntable seals is about 5000 hours and requires regular replacement. 2. Precautions for use. To prevent oil leakage from the turntable, be careful not……

During the use of the Caterpillar 336D excavator, it is important to pay attention to the inspection and maintenance of the engine radiator, hydraulic oil cooler, and related components. Otherwise, it will reduce the engine's heat dissipation efficiency, cause an increase in oil temperature and water temperature, resulting in a decrease in power and increased wear. In severe cases, it can lead to early engine damage accidents. Therefore, the inspection and maintenance of these components cannot be ignored. The heat dissipation of the hydraulic excavator engine adopts suction air cooling, which can achieve good distribution of air passing through the radiator core. To ensure the original heat dissipation effect of the hydraulic excavator engine during use, it is necessary to ensure the integrity of the heat dissipation related components. There are several aspects that affect the heat dissipation effect: 1. Prevent the backflow of hot air during use The filling around the radiator is commonly known as "sponge". But it cannot be replaced by any 'sponge'. The requirements for hydraulic excavators are good corrosion resistance, temperature resistance, and poor ventilation, as their main function is to prevent hot air reflux. To prevent the cold air drawn in from the front……

The heating phenomenon and hazards of the hydraulic system of the CAT 336 excavator. Hydraulic system heating is a common and complex soft fault in excavator operation. Under normal working conditions, the hydraulic system oil temperature of the Komatsu PC200/400 excavator should be below 60oC (the temperature of the oil pump is 5-10oC higher). If it exceeds the limit, it is called hydraulic system heating. Its fault characteristics are: when the excavator is working cold, various actions are normal. After about an hour of mechanical operation, as the hydraulic oil temperature rises, various actuators of the excavator become weak and slow to move, especially when the excavation force is insufficient and the walking and turning are difficult. If the heating phenomenon of the hydraulic system cannot be dealt with in a timely manner, it will affect the system. Extremely adverse effects: (1) The viscosity of the oil decreases, the leakage increases, and the system heats up, forming a vicious cycle; (2) Accelerate oil oxidation, form gel like substances, block small holes in components, cause hydraulic components to malfunction or get stuck, and fail to work; (3) Aging and failure of rubber seals and hoses; (4) Intensify the wear and tear……

How to install and adjust the speed control motor of Caterpillar 336DL excavator? The steps are as follows: 1. Connect the wiring harness of the speed regulator motor to the computer connector; 2. Start the automatic governor motor calibration form of the control program level -1, and determine that the controller speed position is at the "10" position; 3. Identify the acceleration steel cable from the compartment (gray) (or face the motor back cover. The steel cable is facing forward, and the one to the right is the acceleration steel cable), and adjust the locking nut (nut at the end) and nut (nut at the back of the end) on the steel cable to the appropriate distance; 4. Rotate the pulley counterclockwise to ensure that the control lever of the engine governor is in contact with the high-speed idle limiter; 5. Place the steel wire clamp of the acceleration cable into the lower groove of the pulley and wrap it clockwise, so that the steel wire clamp is tightly embedded into the cut of the pulley; 6. Rotate the nut (the nut behind the end) until it is tightly attached to the fixed bracket; 7. Tighten the nut 1-2 turns,……

For such faults, it is generally recommended to start with an internal analysis of the hydraulic system from the outside. The internal reasons are mainly caused by unreasonable system design. Due to factors such as unreasonable matching between components, narrow pipeline channels, multiple bends, small bending radii, and insufficient fuel tank capacity. Such issues should be fully considered during the design phase, otherwise it will result in inherent deficiencies in the hydraulic system of the excavator, which will be difficult to overcome once the product is manufactured. (1) Heating of hydraulic system caused by external factors The engine of the hydraulic pump for the Komatsu PC200 excavator is connected through a shock absorber damper inside the shock absorber box. When dealing with a hydraulic system heating fault in an excavator, it was found that the oil level in the shock absorber box was significantly higher than the screw at the observed oil level (usually about 1.5l). This excess oil generated a large amount of heat during the rotation of the shock absorber damper and transferred it to the hydraulic pump, causing the system to heat up. At this point, the fault can be eliminated by draining the shock absorber oil……

When a used excavator experiences an abnormal sound at the connection of the excavator oil pump during construction, the following steps can be taken to investigate the cause of the malfunction: Remove the dust plug under the motor flywheel and check if the rubber sheet or component is still present If it exists, the coupling element is damaged and needs to be disassembled and replaced If it does not exist, further check the coupling component for worn splines and racks or loose screws If the spline rack is worn or the screws are loose, the coupling component needs to be replaced and the screws tightened If the spline rack is not worn or the screws are not loosened, the hydraulic pump or motor of the excavator needs to be repaired The above are the troubleshooting steps and solutions provided by China Liehuang Second hand Equipment Supplier for "Volvo Excavator Oil Pump Fault" A VOLVO-EC360 excavator experienced brake failure during the rotation of the upper turntable when the working time reached 3000 hours, resulting in the inability to stop the rotation in a timely manner; After continuing to work for another 2 hours, the above-mentioned fault symptoms became increasingly severe. During……

(1) The steps for replacing oil in the fuel tank, hydraulic plunger pump, boom cylinder, stick cylinder, bucket cylinder, swing motor, and left and right travel motors cannot be changed. Due to different projects, only the corresponding parts can be manipulated to make them move, in order to avoid any operational errors. (2) Quality requirements for hydraulic oil: The service life of excavators is directly related to the quality of hydraulic oil. It is necessary to choose hydraulic oil that meets the quality standards certified by the American Society of Engineers. This type of hydraulic oil has a stable viscosity index at 40 ° C to 100 ° C. When replacing, the same brand of hydraulic oil must be used. (3) Requirements for viscosity of hydraulic oil: There are three types of anti-wear hydraulic oil: N32HL, N46HL, and N68HL. Excavators with a service life of 1000 hours should use N46HL+N68HL anti-wear hydraulic oil (50% each). Apply N68HL anti-wear hydraulic oil to excavators with an operating time of over 15000 hours. (4) Service life of hydraulic oil: The service life of hydraulic oil is 4000~6000 hours, approximately two years. In spring and autumn every year, there is a large temperature difference……

The hydraulic oil in the hydraulic oil tank of a used excavator is half of the total oil used in the hydraulic system of the entire machine, and the remaining half of the hydraulic oil is stored in the hydraulic pump, motor, multi way valve, hydraulic cylinder, and various pipelines When changing the oil, if only the hydraulic oil in the tank is replaced instead of replacing all the hydraulic oil in the vehicle's hydraulic system, this method only involves blending old oil with new oil If two grades of hydraulic oil are mixed together, it can also cause the oil to deteriorate. For example, a Caterpillar 336D excavator uses about 520L of hydraulic oil for the entire hydraulic system, while the hydraulic oil in the hydraulic tank is about 325L, and the remaining oil is stored in the system. The ratio of oil used in the hydraulic system of excavators of various brands to the volume of the fuel tank is generally consistent. Preparation work for replacing hydraulic oil (1) When replacing hydraulic oil on an excavator, the following preparations should be made: purchase oil for the entire hydraulic system of the vehicle. (2.5 times the capacity of the……

Regularly inspect and replace the filter element of the CAT 336 excavator filter In order to prevent dust and impurities contained in the added oil from entering the main parts of the machine, protective measures have been taken on the excavator. Multiple filters have been installed on an excavator, each playing its own important role. (1) Air filter The combustion of fuel inside the engine requires fresh air. The air filter can remove dust and other foreign objects from the air drawn into the combustion chamber from the outside, to prevent wear of engine cylinder liners and piston rings. (2) Oil and fuel filters Oil and fuel are easily mixed with moisture and dust during storage and refueling. Filters can filter out foreign objects and prevent wear on internal system components of the engine. In addition, if these filter elements are heavily contaminated, it can lead to poor oil or fuel flow, insufficient engine power, or poor lubrication, resulting in engine damage. (3) Hydraulic oil filter The function of hydraulic oil is to convert the medium of power, so it is strictly prohibited to mix dust and other foreign objects. The hydraulic oil filter can prevent impurities from entering various……

Cat 320D excavator fuel system issue: Fuel system failure is one of the main reasons for unstable engine speed. Fuel filter blockage, insufficient fuel pump pressure, and clogged fuel injectors can all affect fuel supply and cause unstable engine speed. Cat 320D excavator ignition system issue: Ignition system faults, such as ignition coil failure, spark plug wear, poor ignition circuit contact, etc., can affect the ignition effect of the engine and cause speed fluctuations. Mechanical failure: Internal mechanical failures of the engine, such as excessive valve clearance, valve spring breakage, piston wear, etc., can cause unstable engine operation. Sensor and electrical system issues: Sensor failures or control module problems can also affect the engine's speed control, leading to unstable speed. Air filter issue: Air filter blockage or air leakage in the intake pipe can cause insufficient engine intake, affecting combustion efficiency and power output, resulting in unstable engine speed. Hydraulic system issues with Cat 320D excavator: Hydraulic system failures, such as main pump wear and improper relief valve settings, can affect the efficiency and stability of the excavator, thereby affecting engine speed. The methods to solve the problems of these cat 320D used excavators include: Check and replace fuel filter:……

The main reasons why the generator of the CAT 320D excavator does not generate electricity include the following: Battery failure: Aging or damage to the battery can result in insufficient power supply to the generator, thereby affecting its normal operation. It is necessary to check the health condition of the battery and replace it if necessary. Generator malfunction: The generator is the core component of power generation. If the generator is damaged or malfunctioning, it will result in the inability to generate electricity normally. It is necessary to check whether the rotor and stator of the generator are damaged, and whether the winding is normal. If any abnormalities are found, they need to be replaced or repaired in a timely manner. Poor wiring: Poor contact, looseness, or corrosion between the battery connection line and the generator output line can cause poor power transmission and affect the power generation effect. Need to check the wiring condition to ensure good connection. Other factors such as excessive clearance between the motor rotor and stator, wear or damage to internal components of the motor, and burnout of coil wires can also cause the generator to not generate electricity. These issues require detailed inspection and……

CAT 320 excavator battery voltage insufficient: Check if the battery voltage is normal. Low voltage can cause difficulty starting. Starter malfunction: Check if the starter is working properly. If there are any abnormalities, replace starter 1. Ignition system malfunction: Check the ignition system, including spark plugs and ignition coils. If there are any abnormalities, they need to be checked and replaced. Fuel system issues: Check if the fuel system is blocked or leaking, if the fuel quality meets the requirements, and if the fuel supply is normal. Fuel injector malfunction: Check for leaks or blockages in the fuel injector and replace it if necessary. Valve clearance issue: Check if the valve clearance is normal. If there is a problem, adjust valve clearance 1. Engine control unit (ECU) malfunction: Check if the ECU is working properly. If there are any abnormalities, replace ECU 12. Circuit malfunction: Check the circuit system to ensure that all connection points are in good contact and there are no open or short circuits. Air intake and exhaust system issues: Check for blockages or leaks in the air intake and exhaust system to ensure smooth operation. The specific steps to solve the problem of no response when……

When the CAT 320d excavator is stuck, the first thing to check is the vehicle's fuel system. Check if the fuel filter is clogged. If any accumulated impurities or sediment are found, it should be replaced and cleaned in a timely manner. At the same time, the working condition of the fuel pump should also be checked to ensure normal fuel supply. If there is a problem with the fuel system, it may lead to insufficient fuel supply, which in turn can cause unstable idling or stalling of the vehicle. The problem of the CAT 320d excavator being stuck may also be related to the air filter. After prolonged use, the air filter will accumulate a large amount of dust and impurities, thereby reducing the amount of air entering the engine, resulting in insufficient combustion and causing the vehicle to stall. Therefore, regular cleaning or replacement of the air filter is very necessary. You can determine whether cleaning or replacement is necessary by checking the color and smell of the air filter. The problem of the CAT 320d excavator being stuck can also be solved through regular maintenance and upkeep. Firstly, pay attention to changing the engine oil and filter……